Basic Info

Description of contribution in a few bullet points

• Enabled commit-specific fetching of origin on non-shallow clones containing hashes.
• This allows us to clone PRs from repositories not tied to the source branch for history (external forks).
• Added an explicit test skip due to failure of detection of svn in windows-2025.

Description of how this change was tested

1. Testing against vcs2l old pull requests

• First, clone the codebase:

  git clone git@github.com:ros-infrastructure/vcs2l.git vcs2l-ext-fork

• Next, use the following repos.yaml to get the commit hash of the following external fork:

  ---
  repositories:
    vcs2l-ext-fork:
      type: git
      url: 'https://github.com/ros-infrastructure/vcs2l.git'
      version: '4ad2dd14b0033c275e5faff7935c4a7d7581fee4'

• Finally, update the existing repository:

  vcs import --input repos.yaml

  This will successfully checkout the repository to the specific hash.
  This step fails without this contribution with the following error message:

  === ./vcs2l-ext-fork (git) ===
  Could not checkout ref '4ad2dd14b0033c275e5faff7935c4a7d7581fee4': fatal: reference is not a tree:    4ad2dd14b0033c275e5faff7935c4a7d7581fee4

2. Test against the reproduction step in the parent issue - dirk-thomas/vcstool#258

• Reproduction measures specified by @timor-raiman

  git clone git@github.com:timor-raiman/action-ros-ci.git -b vcs-issue && cd action-ros-ci
  git fetch origin +refs/pull/3/*:refs/remotes/origin/pr/3/*
  export PRMERGE_SHA=`git rev-parse origin/pr/3/merge`
  rm -rf new-path/ && mkdir -p new-path/
  cat test-vcs-issue.repo | envsubst | vcs import --force --recursive new-path/